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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ (20,956)us-gaap_NetIncomeLoss | $ 31,296 us-gaap_NetIncomeLoss | $ 94,960 us-gaap_NetIncomeLoss | $ 72,649 us-gaap_NetIncomeLoss | $ 15,376 us-gaap_NetIncomeLoss | $ 39,570 us-gaap_NetIncomeLoss | $ (9,264)us-gaap_NetIncomeLoss | $ 66,461 us-gaap_NetIncomeLoss | $ 177,949 us-gaap_NetIncomeLoss | $ 112,143 us-gaap_NetIncomeLoss | $ 116,911 us-gaap_NetIncomeLoss
Other comprehensive income, before tax: |  |  |  |  |  |  |  |  |  |  |
Gains on hedging instrument |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Other comprehensive income, before tax |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Income tax expense related to gains on hedging instrument |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Other comprehensive income, net of tax: |  |  |  |  |  |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income |  |  |  |  |  |  |  |  | $ 177,949 us-gaap_ComprehensiveIncomeNetOfTax | $ 112,143 us-gaap_ComprehensiveIncomeNetOfTax | $ 116,911 us-gaap_ComprehensiveIncomeNetOfTax

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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